Unless someone has verified Buffalo Bore's claims, I only
see them as "claims" and not fact. And whoever verifies
it cannot ask BB for free ammo for testing. They have
to be anonymous buyers.

I have not personally tested the Barnes load. I have tested the 180 gr. They claim 1311 fps from a G20. I averaged 1335 fps (IIRC, it was summer temps). Others have reported chrony results that are consistent with BB claims too. I have no reason to doubt their claims.

has anybody, other than Buffalo Bore, been able to safely move a 155grTAC-XP in the 1400fps range?

Now I wonder if that is too fast, check out this fragmentation @1200fps:http://www.brassfetcher.com/index_files/400CorBon.htm
(same bullet, different cartridge)
However Cor-Bon pushes the 155's to 1200, and they seem like the kinda folks that may know what they are doing

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Did you see the bullet fragments?
This is what I was mentioning about over driving the HP type bullets, they open to their max expansion dia. then start to roll back on itself to a smaller dia. even shedding fragments, till it comes to rest.

So in therory, is it better to reach total expansion rather than over driving the projectile to the point it rolls back and/or sheds its petals?